1/*
2 * INET		An implementation of the TCP/IP protocol suite for the LINUX
3 *		operating system.  INET is implemented using the  BSD Socket
4 *		interface as the means of communication with the user level.
5 *
6 *		PF_INET6 protocol dispatch tables.
7 *
8 * Version:	$Id: protocol.c,v 1.1.1.1 2007/08/03 18:53:52 Exp $
9 *
10 * Authors:	Pedro Roque	<roque@di.fc.ul.pt>
11 *
12 *		This program is free software; you can redistribute it and/or
13 *		modify it under the terms of the GNU General Public License
14 *		as published by the Free Software Foundation; either version
15 *		2 of the License, or (at your option) any later version.
16 */
17
18/*
19 *      Changes:
20 *
21 *      Vince Laviano (vince@cs.stanford.edu)       16 May 2001
22 *      - Removed unused variable 'inet6_protocol_base'
23 *      - Modified inet6_del_protocol() to correctly maintain copy bit.
24 */
25
26#include <linux/errno.h>
27#include <linux/types.h>
28#include <linux/socket.h>
29#include <linux/sockios.h>
30#include <linux/net.h>
31#include <linux/in6.h>
32#include <linux/netdevice.h>
33#include <linux/if_arp.h>
34
35#include <net/sock.h>
36#include <net/snmp.h>
37
38#include <net/ipv6.h>
39#include <net/protocol.h>
40
41struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
42static DEFINE_SPINLOCK(inet6_proto_lock);
43
44
45int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol)
46{
47	int ret, hash = protocol & (MAX_INET_PROTOS - 1);
48
49	spin_lock_bh(&inet6_proto_lock);
50
51	if (inet6_protos[hash]) {
52		ret = -1;
53	} else {
54		inet6_protos[hash] = prot;
55		ret = 0;
56	}
57
58	spin_unlock_bh(&inet6_proto_lock);
59
60	return ret;
61}
62
63EXPORT_SYMBOL(inet6_add_protocol);
64
65/*
66 *	Remove a protocol from the hash tables.
67 */
68
69int inet6_del_protocol(struct inet6_protocol *prot, unsigned char protocol)
70{
71	int ret, hash = protocol & (MAX_INET_PROTOS - 1);
72
73	spin_lock_bh(&inet6_proto_lock);
74
75	if (inet6_protos[hash] != prot) {
76		ret = -1;
77	} else {
78		inet6_protos[hash] = NULL;
79		ret = 0;
80	}
81
82	spin_unlock_bh(&inet6_proto_lock);
83
84	synchronize_net();
85
86	return ret;
87}
88
89EXPORT_SYMBOL(inet6_del_protocol);
90